Conditions for High-Quality Brazing

Conditions for High-Quality Brazing

For high-quality brazed joints, it is necessary to closely fit the parts to be joined and clean the base metals to make them free of oxides through chemical or mechanical (abrasive) cleaning.
It necessary to maintain proper surface roughness during mechanical cleaning because the capillary action of the filler material takes place more readily on a rough surface when compared to a smooth surface.
Time and temperature also play a key role in the quality of brazed joints. The filler metal’s alloying and wetting action increases with the rise in the temperature of the braze alloy. Typically, the brazing temperature chosen must be higher than the melting point of the filler metal, although there are several other parameters to be considered in temperature selection.
In general, the braze temperature is kept as low as possible in order to reduce heat effects on the assembly, minimize filler metal/base metal interactions, and optimize the life of fixtures. Most production braze processes are designed to reduce brazing time and related costs.
Edited by simuwu
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